Fluid actuated double-acting submersible pump



Aug. 12, 1952 B. F. SCHMIDT FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLEPUMP Filed June 24, 1946 13 Sheets-Sheet 2 .w 7 .M 4 3 2 8 6 a MH 7 7 70/ 9 6 TC u WW .1| I||. ,A I.. M illllilll/ M x l gw. [IL ,v w W L.. WI/lll-: 2 J7 2 A0 5 4 ly au. 6 a a u n 5 70 n n am 0 0 4 7 f 9 a .n 5 yQ0. a ,i Q. Q x gmk K K X Ar Ton/vn Aug. 12, 1952 B F. SCHMIDT 2,505,500

#r MERSI D Filed June 24, 1946 13 Sheets-Sheet 3 www" INI/ENTOR.BENJAMIN E SCHMIDT Aug. 12, 1952 B. F. SCHMIDT 2,606,500

FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 194e 13sheets-sheet 4 Aug. 12, 1952 B. F. SCHMIDT 2,606,500

FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 1946 15Shees-Sheet 5 'f' IN V EN TOR.

` BENJAM/N F'. SCHMIDT BY MJ] A TTOR/VE Y Aug. 12, 41952 B. F. SCHMIDTFLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed Jne 24, 1946 13Sheets-Sheet 6 6 VNTOR.

BENJAM//v scHM/DT 5^' 50 ATTORNEY Aug. 12, 1952 B. F. SCHMIDT 2,605,500

FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 1946k 13Sheets-Sheet 7 9/ A BENJAMIN F SCHMIDT B. F. SCHMIDT Aug. 12, 19522,606,500

` FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP 15 Sheets-snee?l 8 FiledJune 24, 1946 INI 'EN TOR. BENvMM/N F. SCHM/DT ATTORNEY Aug. l2, 1952FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 1946 B. F.SCHMIDT 2,606,500

13 Sheets-Sheet 9 INI/ENTOR.

BEM/AMW F, SCHH/0T ,4T TOR/ver Aug. 12, 1952 B. F. SCHMIDT l FLUIDACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 194e 13Sheets-Sheet lO :fi/l...

j INVENTOR. BENJAMIN F. SCHMIDT ATTORNEY Aug. 12, 1952 B. F. SCHMIDT.2,606,500

r FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24, 1946 13Sheets-Sheet 11 INVENTOR. BENJAMIN E SHM/DT Arf-@Riek Aug. 12, 1952 B.F. SCHMIDT FLUID ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP Filed June 24,1946 13 Sheets-Sheet l2 INVENTOR. BENJAM/N l". SCHH/D7' Aug. 12, 1952FLUID Filed June 24, 1946 B. F. SCHMIDT 2,606,500

ACTUATED DOUBLE-ACTING SUBMERSIBLE PUMP y 15 Sheets-Sheet 13 .'INVENTOR.

BENJAMIN E SCHM/DT ATTORNEY Patented Aug. 12, 1952 FLUID ACTUATEDpoulains norme` sUBMnRsIBLi; BUMP Benjamin F. Schmidt, Los Angeles,Calif'. Application June 24, 1946, Serial No. 678,741

(C1. S-i5) 3,7 Claims.

M-y inventionr relates in general to power operated pumps, and relatesin particular to a pump f or pumping fluids from deep Wells, this pumphaving a novel pumping mechanism and motor therefor combined in a singleunit which is submerged in the liquid in the Well.

It is an object of the invention to provide a positively actingdisplacement pump which avoids the use of sucker rods such as commonlyextended from plunger pumps, to the top of the well and avoids the useoi pistons and cylinders in contact with the liquid which is beingpumped from the well, In this respect the invention, in avoiding theexposure of f rictionally engageable parts to the pumped liquid whichgenerally carries sand or other abrasives, achieves a greatly extendeduseful life of the operating parts o1 the pumping mechanism, therebymaking it possible to use the pump for long periods of time beforenecessity of pulling the pump from the well for adjustment or partreplacement is required.

It is an object of the invention to `provide a deep well pump whereinthe pumping force or power is transmitted from the power source of thepumping device to the movable walls of the device which contact theordinarily contaminated liquid being pumped by means of a clean liquid,such as thin highly reiined oil, this oil lubricating the moving partsof the device and thereby protecting the same against rapid Wear.Accordingly, the internal operating parts of the device which move infrictional engagement, one with the other,l are maintained in a bath ofoil, protected from wear producing substances.

A further object of the invention is to provide a deep Well pump havingone or more pumping chambers which receive the liquid to be pumpedthrough inlet valves, these pumping chambers Vhaving therein bellows orbladder elements which,

upon expansionA by the application of internal fluid pressure thereto,force the liquid through discharge valves into passages which lead tothe top of the well. p A

An object of the invention. is i@ prei/161.6111 a Pump having pumpingChambers inlet and discharge valves so arranged that the presence ofsand in the pumped liquid will have a minimum Wearing effect on thevalve parte, In this pumping device both the inlet and outlet valves ofthe pumping chamber are arranged at the lower end of the pumping`chamber so that sand or other abrasive substances which are carried intothe pumping chambers will be immediately ref moved therefrom andtherefore will not be per-,

2 mitted to accumulate by sedimentation in the bottom of the pumpingrchambers.

An important object of the invention is to provide a pumping mechanismof the character described having a motor driven pump for pumping theoperating fluid and means for directing this operating huid into theexpansile contractile members which are disposed in the crude oilpumping chambers oi the device, whereby these expansile-contractilemembers will be expanded in timed relation so as to pump a substantiallycontinuous iiow of oil through the outlet passage of the device.

A further object oi the invention is to provide a pump of the characterdescribed in the preceding paragraph, wherein the motor driven pumpoperates continuously to pump the operating liquid, for example, oil,there being means for progressively or alternately connecting the outletof the motor driven pump with the expansilecontractile members, and itis a further object to provide a valve means which Will connect the4outlet of the motor driven pump with one ofthe expansile-contractilemembers and at the same time connect the inlet of the pump with theother of the eXpansile-contractile members, so that the rst of theeXpansile-contractile members will be subjected to fluid pressure fromthe pump and the other of the eXpansile-contractile members will beconnected to suction, the aforesaid valve means being reversed in timedrelation so that the expansile-contractile members will be alternatelyexpanded and contracted and the pumped liquid will be alternately drawninto the pumping chambers while at the same time, pumped liquid is beingdischarged alternately from the pumpingchambers.

A further object is to provide a pump of'tl'ie character set forth inthe preceding paragraphs having for operation of the valve whichcontrols the flow of the operating iluid, a timing means which isoperated by the movement, of the operating fluid, and` a further objectis to provide a means having the Characteristics of a meter throughwhich the operating iiuid passes, this meter measuringthe flow ofoperating fluid and reversing the position of the control valve whenrequired quantities of the operating flow have passed through the:metering device.

Further QbisQiS'Qf the invention include a novel and effective meansfor, connecting the upper end of thepumpin'g deviceV to a string oftubing through which the Dumped liquid is. Carried to the topoi the welland, for connecting electrical cables/,to` the upper end oi the pumpingdevice, whereby the motor or motors of the device may be energized;means for maintaining the motors and other internal operating parts ofthe device in a bath of clean oil; a compact and effective pump forpumping the operating fluid; a novel four-way valve for controlling thedelivery of the operating fluid into the expansile-contractile membersand for connecting these members with the inlet of the operating fluidpump; a simple and effective means whereby the movement of the operatingparts of the metering device are translated into controlling movementsand effects whereby the operating liquid control valve is actuated; acooperation of simple and compact parts whereby the power and pumpingmechanisms are embodied in an elongated slender structure which may belowered into a well of relatively small diameter; a simple arrangementof pumping chambers at the lower end of this structure; and simple anddurable expansile-contractile bellows or bladder elements operative inthe pumping chambers.

A further object of the invention is to provide in a pump of thischaracter a control for the pumping action which responds to pressuresin the eXpansile-contractile bellows. In this alternative control forthe pump, pilot valves are provided which respond to excess pressuresbuilt up in the bellows or bladder elements.

Further objects and advantages of the invention will be brought out inthe following part of the specification.

Referring to the drawings, which are for illustrative purposes only:

Fig. 1 is a partly sectioned elevational view showing a preferredembodiment of my pump;

Fig. 1a is a diagrammatic drawing of the pumping device shown in Fig. 1;

Fig. 2 is a fragmentary sectional view of the portion 2 of Fig. 1;

Fig. 2a is a cross section, to enlarged scale, taken as indicated by theline af-a of Fig. 2;

Fig. 3 is a fragmentary elevational sectional View of the portion 3 ofFig. 1;

Fig. 4 is a fragmentary elevational sectional view of the portion 4 ofFig. 1;

Fig. 5 is a fragmentary elevational sectional view of the portion 5 ofFig. 1;

Fig. 5a. is a view looking upward from the plane a-a of Fig. 5;

Fig. 5b is a fragmentary side view of a frame at the upper end of thepiston and associated parts.

Fig. 6 is an enlarged sectional view of the portion 6 of Fig. 1, theupper half of Fig. 6 being sectioned substantially as indicated by theline 6 6 of Fig. 6a and the lower portion thereof being sectionedsubstantially on the transverse center line of Fig. 6b;

Fig. 6a is a sectional view taken as indicated by the line ct-a of Fig.6;

Fig. 6b is an enlarged sectional view taken as indicated by the line b-bof Fig. 6;

Fig. 7 is an enlarged sectional view of the portion 1 of Fig. 1, themiddle and lower parts of this ligure being sectioned as indicated bythe lines 'I-T of Figs. 7b and 7c;

Fig. 7a is an enlarged cross section taken as indicated by the line -aof Fig. 7 n l Fig. '7b is a cross section, to enlarged scale, asindicated by the line b-b of Fig. 7;

Fig. '7c is an enlarged cross section taken as indicated by the line c-cof Fig. 7;

Fig. 7d is a plan view of the oscillating plate, a partial plan of whichis shown in Figure 7a.

Fig. 8 is an enlarged fragmentary section of the portion 8 of Fig. 8,the lower part of Fig. 8 being sectioned as indicated by the line 8-8 ofFig. 8b

Fig. 8a is an enlarged sectional view taken as indicated by the line a-aof Fig. 8;

Fig. 8b is an enlarged cross sectional view taken. as indicated by theline b-b of Fig. 8;

Fig. 8c is an enlarged fragmentary sectional view taken as indicated bythe line c-c of Fig. 8,y to show the upper ends of the connector mem--bers;

Fig. 8d is an enlarged fragmentary sectional view taken as indicated bythe line d--d of Fig. 8c;

Fig. 8e is a perspective view of a connector with its tube clamping bodyor plug;

Fig. 9 is an enlarged fragmentary sectional View of the portion 9 ofFig. 1, the upper portion in the region of the line a-a of this gurebeing sectioned as indicated by the line 9-9 of Fig. 9a, the portion ofthis figure below the line b-b being sectioned as indicated by the line9 9 of Fig. 9b, and the portion of this figure below the line c-c beingsectioned as indicated by the line 9-9 of Fig. 9c;

Fig. 9a is a cross sectional view taken as indicated by the line a-a ofFig. 9;

Fig. 9b is an enlarged cross section taken as indicated by the line b-bof Fig. 9;

Fig. 9c is an enlarged cross Section taken as indicated by the line c-cof Fig. 9;

Fig. 9d is an enlarged fragmentary sectional view taken as indicated bythe line d-d of Fig. 9;

Fig. 9e is a perspective View of a lower connector or closure for atube, and the tube clamping plug therefor;

Fig. 10 is an enlarged fragmentary schematic sectional view taken asindicated by the line III-ID of Fig. 7a;

Fig. 10a is a fragmentary sectional view taken as indicated by the linea-a of Fig. 10;

Fig. 11 is an enlarged fragmentary schematic sectional view showing theduct arrangement at the upper end of the valve chamber of the device;

Fig. 12 is an enlarged fragmentary schematic sectional View showing theduct arrangement at the lower end of the valve chamber;

Fig. 13 is a longitudinal section through a preferred form of flexiblepumping member, intermediately shortened so that both of the pumpingmember can be shown in the single view;

Fig. 13a is a cross section taken as indicated by the line a-a of Fig.13;

Fig. 13b is a cross section taken as indicated by the line b-b of Fig.13;

Fig. 13c is a cross section taken as indicated by the line c-c of Fig.13;

Fig. 13d is a cross section taken as indicated by the line d-d of Fig.13

Fig. 14 is a longitudinal section through an alternative form of aliexible member;

Fig. 15 is a schematic view showing my pump with the alternativepressure-responsive control which may be employed in substitution forthe metering device previously shown.

The pumping device shown in Fig. 1 is of vertically elongated form sothat it may be lowered into a well by means of tubing I0 which has alsothe purpose of conveying the pumped duid-for example, oil-to the top ofthe well. The pumping device includesl an outer shell II which isconnected to the tubing I0 by a tting I2. The vertically elongatedtubular shell II contains therein the power section I3 and the controlsection I4 of the pumping device, these sections I3 and I4 beingcontained in connected inner tubular shells I5, I5a and I6 of suchdiameter as to leave an annular space or passage I1, through which thepumped fluid may pass from the upper end of the pumping section I8 ofthe device to the fitting I2 and then into the lower end of the tubingIII.

The power section I3 has in the upper end thereof electrically drivenmotor means represented by a motor I9 which may be employed singly or inmultiplicate, depending upon the power required. The power section alsoincludes a pump 20 for operating iluid, this pump 20 having a pressureoutlet 2| and a suction inlet 22. From the outlet 2l a pressure passage23 leads downwardly into the control section of the pumping device and asuction or return passage 24 leads downward from the suction inlet 22.

In the control section I 4 of the pumping device there is a meter 24which is connected in series with the pressure passage 23, and a controlvalve 25 comprises a cylinder 26 in which a piston 21 is verticallyslidable. The lower end of the pressure passage 23 connects with thecylinder 26 through spaced ports 28 and 29, and above the ports 28 and29 ports 30 and 30 connect the lower end of the suction passage 24 withthe cylinder 26.

The vertically elongated pumping section of the device has pumpingchambers 3l and 32 in side by side relation, in whichexpansile-contractile members 33 and 34 are operative. Each of thechambers 3| and 32 has an inlet valve 35 and a discharge valve 36. Thedischarge valves 3S communicate with a rising passage 31 which connectswith the lower end of the passage I1 of the control and power sectionsof the pumping device. An operating fluid passage 38 extends upward fromthe eXpansile-contractile member 33 and is connected to the space withinthe cylinder 26 by ports 39 and 40, which are respectively in thehorizontal planes of the ports 28 and SI. An operating fluid passage 4Iextends upwardly from the expansile-contractile member 34 and isconnected to the space within the cylinder 26 by ports 42 and 43respectively in the horizontal planes of the ports 29 and 30. The valvepiston 21 has therein annular channels or ducts 44 and 45 spaced so thatwhen the piston 21 is in the lowered position in which it is shown inFig. la, the channel 44 will connect the pressure passage 23 with theoperating fluid passage 38 through the ducts 28 and 39, and the channel45 will connect the operating lluid duct 4I with the suction passage 24through the ports 43 and 30. At this time, operating fluid underpressure will pass into the expansile-contractile member 33 through thepassage 38 and operating lluid will pass out of the member 34 throughthe passages 4I and 24 to the inlet of the pump 20 which will deliversuch fluid into the upper end of the pressure passage 23 until thiscycle of operation is completed under control of the meter 24 which iscapable, when a measured quantity of operating fluid has passed into theexpansile-contractile member 33, of actuating the control valve 25 so asto reverse the ilows of operating fluid through the passages 38 and 4I.For operation of the valve 25, I provide means for hydraulicallyshifting the valve piston 21 from one of its positions to the otherpositively and rapidly.

The valve cylinder 26 provides at the ends of the piston 21 chambers 46and 41 which are connected to the pressure passage 23 through orifices48 and 49 so that When these chambers 46 and 41 are closed againstescape of iluid therethe piston 21 will be balanced. At the lower endvof the chamber 46 there is a pressure release port 50 which is connectedthrough a pressure release passage 5I with a port 52 of a pilot valve 53having a valve body 54 which is rotated bythe meter 24' as will behereinafter explained. At the upper end of the chamber 41 there is apressure release port 55 which is connected through a pressure releasepassage 56 withfa port 51 of the pilot valve 53. a transverse passage orport 58 which communicates through vertical passages59 with a chamber60, Fig. 10, at the lower end of the valve body 54, this chamber 69being connected through a passage 6I with the pressure return passage24. At the ends of the valve piston 21 there are closures 62 and 63yadapted to respectively close the pressure release ports 50 and 55 whenthe valve piston 21 reaches the end of its intended travel. In Fig. 1athe closure 62 is in a position to close the pressure `release port 50so that even though the pressure release passage 5I is connected throughthe pilot valve 53 and the passage 6I with the return passage 24, ilowofV fluid from the chamber .46

cannot occur. y

When the action of the meter24' rotates the plug 54 of the valve 53 soas to bring the port 58 into conjunction with the port 51, the pressurerelease passage 56 of the upper chamber 41 of the valve device 25 willbe connected to the suction passage 24, and at the same time the valveplug 54 will close off the pressure release passage 5I of the lowerchamber 46 of the valve device 25. The capacity of the `pressure releasepassages 5I and 56 is made purposely greater than that of the orifice49, so that when the operation of the valve device 53 opens the passages5I and 56 in their proper order,V the valve piston 21 will be shifted asa result of hydraulic differential pressure against the ends thereof.For example, with the valve piston 21 `in` the lowered position in whichit is shown in Fig. la, the opening of the pressure release passage 56will result in an outflow of iluid from the chamber 41 at a rate greaterthan the inilow of fluid through the orifice 48, there being then aYreduction in pressure in the chamber 41 so that iluid which enters thelower chamber 46 under pressure from the orice 49 acts against the lowerend of the Valve piston 21 to shift it upwardly, this upward shiftingmovement of the piston 21 continuing until the closure 63 closes thepressure release port 55, thereby stopping the escape of fluid from thechamber 41. When the valve piston 21 reaches its raised position, theilow of operating iluid in the passages 38 and 4I will reverse. Thechannel 44 of the piston 21 will then connect the pressure passage 23with the passage 4I through the ports 29 and 42 so that iluid underpressure will be fed into the expansile-contractile member 34, and thechannel 45 of the piston 21 will connect the passage 38 with the returnor suction passage 24 through the ports 40-and 3| so that theexpansile-contractile member 33 may collapse. The reversal of the cycledescribed in the foregoing will occur intermittently under control ofthe meter, so that the members 33 and 34 will be consecutively andalternately expanded and collapsed, thereby performing alternate pumpingactions in the pumping chambers 3l and 32, resulting in a substantiallyconstant flow of pumped iluid upward through the passage I1 into tintothe passage 5I The bodyv 54 of the valve 53 has the delivery tubing Iwhich extends to the surface of the ground.

As shown in Fig. 2, the fitting I2, which is connected to the upper en dof the outer shell II, has therein a pumped iiuid passage 64 havinginternal threads 65 to receive the threaded lower end of the tubing I0.This passage 64 communicates with the space 66, Fig. 3, in the upper endof the shell I I, which space 6'6 constitutes a continuation of thepumped oil passage |1. The fitting |2 has also therein a passage 61through which a cable conduit 68 passes into the upper end of the outershell as shown in Fig. 3. This cable conduit comprises a metal tube 69through which electrical conductors 10 extend, these conductors 10 beingembedded in a body of rubber 1| which is secured in place so as to llthe interior of the tube 69 and thereby provide a. seal to prevent entryof fluid into operative parts of the device through the cable conduit68. At the upper end of the lcable conduit 68 there is a cable connectorbody 12 adapted to be connected to a cable connector member 13 which isdisposed at the lower end of a cable 14 which extends from a source ofpower at the top of the well for the purpose of supplying electricalenergy to the motor I9 of the pumping device. To provide space for theconnectors 12 and 13, the tubing I0 is locally flattened as shown inFig. 2.

As shown in Fig .3, a plug 15 is provided at the upper end of the outershell I I for connection of the fitting |2, this plug being threadedinto the upper end of the shell II and having therein openings 16 whichconnect the bifurcated lower end of the passage 64 with the space 66.The plug 15 has also an opening 11 through which the cable conduit 68passes, there being packing means 18 in the opening 11 for sealingaround the cable conduit 68. As further shown in Fig. 3, the cableconduit 68 is carried through a clamping and packing device 19, disposedat the upper end of a cylindrical cage 80, to a multiple electricalconnector 8| which is carried in the connector tting 82, Fig. 4, bywhich the cage 80 is connected to the upper end of the shell I havingtherein the motor I9 which is of slender vertically elongated form andmay be employed in multiplicate. The cage 80 consists of a section ofmetal tubing having openings 83 therein, through which the pressure ofiiuid in the space or passage I1 may be transmitted to the space 84surrounding the pressure balancer which is disposed within the cage 80.This pressure balancer 85 consists of a tubular wall of flexiblematerial supported so that the intermediate portion thereof may ilex andthereby act as a barrier between a body of protective oil occupying theinterior of the pressure balancer and the pressure of fluid in theannular pasage I1 surrounding the power and control sections |3 and |4of the device, the internal space 86 of the pressure balancer 85communicating through a passage 8S in the tting 82 with the interior ofthe motor shell I5 which in turn communicates with the interior of theshell I6 of the control section as will be hereinafter described.

The ends of the tubular pressure balancer 85 are closed by upper andlower cups 89 and 90 which surround the cable conduit 68 at spacedpoints within the cage 80, these cups 89 and 90 having internallytapered side walls 9| to receive the ends of the tubular pressurebalancer 85 so that these ends of the member 85 may be clamped againstthe walls 9| by clamping bodies 92 which are externally taperedtocorrespond to the taper of the walls 9| of the cups 89 and 90 and arepulled into the cups 89 and 90 by use of screws 93 and 94. The clampingbodies 92 are of annular form so that they may surround the conduit 68.Also the lower cup is secured to the upper face of the fitting 82 andhas therein a portion of the intercommunicating passage 80, throughwhich fluid pressure may be transmitted between the space 86 within thepressure balancer 85 and the interior of the motor shell l5.

As shown in Fig. 4, the motor shell I5 has at its upper end a ringfitting 95 which serves as a means for the attachment 96 to support theupper end of the shaft 91 which carries the rotor 98 of the motor |9which is of slender form so that it will operate within the motor eld99. Electrical connections between the conductors 10 of the conduit 68and the motor I9 are schematically shown at |00.

At the lower end of the motor shell I5 there is a tting |0| as shown inFig. 4, having therein a bearing |02 to support the lower end of themotor shaft 91. This fitting I0| is secured to the upper face of aconcentric bearing support |02 which is of tubular form and extendsdownwardly within the pump shell |5a to the upper end of which it isconnected. As shown in Fig. 5, a rugged radial bearing |03 is supportedin the lower end of the bearing support |02', to carry the lower` end ofa shaft |04 which projects upwardly from the annular body |05 of aneccentric or crank member |06. As shown in Fig. 4, the upper end of theshaft |04 is supported by a bearing |01 and is connected to thedownwardly projecting end |08 of the motor shaft 91 by a sleeve coupling|09 so that the eccentric |06 will be driven by the motor.

In the lower face of the body |05 there is a circular recess I I0 toreceive an adjustable eccentric disc having an eccentric opening I|2which receives a bearing block I3. The disc I may be rotated in therecess I0 and may be held in its various positions of adjustment by ascrew ||4 which is threaded into an opening ||5 in the body |05.

As shown in Fig. 5a, the disc l I has a plurality of peripheral channelsH6, any of which channels H6 may be brought into conjunction with thebody of the screw ||4 by rotation of the disc in the recess ||0, therebychanging the distance of the bearing block ||3 from the axis of rotationof the body |05.

A body ||1 is secured in the lower end of the shell member I5a. On theupper face of the body II 1 there is a valve body IIS superseded by avalve plate |9 against which a pump body |20 is positioned. This pumpbody |20 has near the periphery thereof a plurality of cylinder bores|2| which are parallel to the vertical axis of the body |20. Each of thecylinder bores |2| receives a piston |22 which projects above the upperface of the body |20. Each piston |22 has thereon a rectangular frame|23 to receive a divided cross head block |24 having a spherical opening|25 between its component parts to receive a spherical actuating lever|26 which projects laterally from the lower end of an operating arm |21.The operating arm |21 is supported on a ball |28 formed on a pin |29which is secured in the pump body |20.

'Ihe operating arm |21 consists of a body 30 of generally cylindricalform, which body has the lever |26 projecting therefrom.` This body |30has a spheroidal cavity |3| to receive the lower half of the ball |284and an upwardlyexteding threaded opening |32 to receive the lowerthreaded end of a stem portion |33 which converges upwardly and hasthereon a ball |34 which is received by the bearing block I3, so thatwhen the eccentric member |06 is rotated, the upper end of the operatingarm |21 will describe a circle andv'circumduction of the arm |21- around`the center of the ball |28 will be accomplished. This circumduction orrocking movement of the arm |21 results in a vertical reciprocation ofthe levers |26 which Vertical reciprocation is transmitted through thecross head blocks |24 to the pistons |22. The stem' |33 has a spheroidalseat |35 toengage -theu'pper face ofthe ball |28, and a lock nut |36 isprovided on the stem |33 for locking the stem |33 inthe body |30 whenlthese parts have been adjusted into proper relation to the ball |28.Stems |31 project upwardly from the rectangular frames |23 ofthe pistons|22 and are guided in openings |38 in a guide ring |39.

Adjacent the lower end of each cylinder bore |2| there is a valve cavity|39 drilled upwardly into the pump -body |20, the lower endof this valvecavity |39 communicating with the lower end of the adjacent cylinderbore|2 through an opening. |40; The plate 9 has a port|4| communicating withthe lower end of the valve cavity |39 and an inlet valve closure in theform'of a spring-pressed ball |42 and is seated in the upper end of theport |4|.Also, the. plate ||9 has in communicationwith thelower end ofeach cylinder bore |2| a discharge valve port |43, the lower endofwhichisadapted to be closed by a discharge check valve closureconsisting of a springpressed vball |44 disposed in .a valve cavity |45in the upperspace of the valve body IIB. Each of the cavities l|45communicates with a discharge passage 23a inthe valve body ||8 whichcomprises the upper extremity of the pressure passage 23 described withrelation to Fig. la. It will be understood that inthe followingdescription the openings or passages in the various parts which form apart of the pressure passage 23 willbe identiiied by the numeral 23 anda conjoined letter. The body ||1 at the lower end of the shell |511 haspassages 23h therethrough which' connect the passages 23al with a recess|46 in the lower face of the body ||1this recess |46 communicatingwith apressure passage section 23e in a connector body |41 which extendsupwardly into the recess |46. As shown in Fig. 5, portions or sections24a, 24h, and 24o are formed respectively in the valve body |6, the bodyI] and the connector body |41.

|I8 communicates with the lower end of the inlet or suction valve port|4| in the plate |-|9. .In the body 1 a' port |46V connects the section23h of the pressure passage23' with the section 23h of the suctionpassage 24, anda pressuregrelease valve |49 isl extended `across thepassage 24b and is urged intoclosing relation to the port |48 by aspring |50, the strength of which' will determine the pressuredifferential between the `passages 23h and 24bat which the pressurerelease valve |49 will open and permit release of pressure from thepassage 23b throughthe port |48. The inner tubular shell |6, as shown inthe lower part of Fig. 5, threads onto the body ||1 and projectsdownwardly around the connector body |41, around the meter shownin Fig.6, around the valve mechanism shown inrlig. 1, and ends in the lowerpart of the control sectionV of the device as shown in Fig. 8.

The passage 24a in the body The meter 24' comprises a body 5i ofcylindric form having a cylindric bore from end to end thereof toprovide a chamber |52 in which a vaned rotor |53 operates in eccentricposition characteristic of vane type pumps 01' m0130135- The upper endof the chamber |52 is closed by a head |54 which is connected to thelower face of the connector body |41 and has therein continuations ofthe pressure and suction passages 23 and 24 speciically identified bythe numerals 23d and 24d.

As shown in Figs. 6 and 6a, the passage 23d slopes downwardly andforwardly to a port |55 constituting the uid inlet of the meter 24. Thepassage 24d connects with the upper end of a return ypassage portion'24ewhich extends vertically through the side wall of the meter zbody |5|.The lower end of the meter chamber |52 is closed by a head |'56 havingin its upper face an outlet port for the meter chamber |52, this outletport |51 being disposed at the upper end of a pressure passage section23e which slopes downwardly and rightwardly within the head |56. Thehead |56 has also therein a suction passage section 24j, the upper endof which connects with the lower end of the passage section 24e.

The rotor |53 has an upwardly projecting stub shaft |58 which isreceived by a sleeve bearing |59 carried in the upper head |54. A shaft|60 projects downwardly from the meter rotor |53 through a lbearing |6|carried by the lower head |56. v

As shown in Fig. 7, the shaft |60 projects down through the head |56 andthrough a bearing |62 carried by a body member |63 which is connected tothe lower face of the head |56. The shaft |60 has an eccentric pin |64on its lower end which engages a bearing |65 mounted on the leftward endof an oscillating plate |66, a plan of which is shown in Fig. 7d and apartial plan of which is shown in Fig. 7a. At the rightward end of theplate |66 there is a fork |61 which straddles the portion of a screw |68by which the Ibody member |63 is secured to the upper face of a bodymember |69. As the crank pin |64 crosses the leftward end of the plate|66 to describe a small circle, the rightward end ofthe plate |66 iskept from rotation and is permitted to slide back and forth in a lateraldirection, as a result of the engagement of the fork |61 with the screw|68. On the lower face of the plate |66 there is a tooth |69 which, as aresult of the motion transmitted to the plate |66 .by the crank pin |64,is caused to travel through a circle |10, Fig. 7a. f

The upper face of the body member |69 has therein a cavity |1| toreceive a gear |12 which revolves on a portion of the screw. |13 in aposition to be engaged by the tooth |69 as it oscillates. Each movementof the tooth |69 through the circle |10 will advance one tooth of thegear |12, thereby producing a slow rotation of the gear |12 as a resultof the rotation of the rotor |53 of themeter 24'. Secured to the underface of the gear |12 there is a gear segment |14, likewise in the cavity|1|, this gear segment |14 having two teeth |15 adapted to engage theteeth |16 of a gear |11, each time the gear |12 makes a completerevolution. D f Y As shown in Fig. 10, the gear |11 is Xed on the upperend of a shaft |18 .which projects upwardly from the valve body or plugpreviously described with relation to Fig. la. This valve body I54 isrotatable in a recess |1'9formed in the body I 69 below the recess |1l'.Thevalve body 54 is held in the recess |19 by a' threaded plug |80 whichsurrounds the shaft |18 below the gear |16. The body member |69 hastherein pressure and suction passage sections 23j and 24g whichcommunicate respectively with the passage sections 23e and 24f oftherhead |56, through passages Yformed, in the body member |63 asindicated by dotted lines |8| in the upper part of Fig. 7. The bodymemberv |69 has also therein the upper reduced portion of the chamber 41formed above the valve piston 21 in the valve cylinder 26 which isformed in the body |82 which abuts the lower face of the body |69. Inalignment with the passage sections 23j and 24g, the body, |82 hasextending downwardly from the upper face thereof the lower extremity ofthe pressure passage,A embodied in the passage section 23g, and thesuction passage section 24h. which constitutes the lower end of thesuction passage 24.

The body |82 has also the upper ends 38a and 4|a of the operating iiudpassages 38 and 4| first described with relation to Fig. 1a. The body|82 has likewise therein the ports 28, 29, 30, 3|, 39, 40, 42 and 43adapted to cooperate with the channels 44 and 45 of the valve piston 21.The passages 38 and 4| are carried downward by passage sections 38D and4|b in the body member |83 which closes the lower end of the inner shellI and which rests against the lower end of the body member |82, passagesections 38e and 4|c in the head |84 which closes the lower end of theouter shell Il, and terminates with passage sections 38d and 4| d of thefitting |85.

As shown in Figs. 1 and 7b, a connection is made with the chamber 46 atthe lower end of the piston 21 through a small passage 23h drilleddownwardly from the lower end lof the passage section 23g, this passage23h. being continued downward into the upper portion of the body |83,Fig. '7, to meet a diagonal passage 231 in which a ow control orifice 49is situated as shown in Fig. 12. Fluid pressure from the pressurepassage 23 is conducted into the upper chamber 41 as shown in Figs. 7,7a. and 11 by drilling and threading an opening |86 connecting thepassage section`23f and the upper portion 41a of the chamber 41 andplacing therein an orice member 49.

The pressure release passage 5|, shown schematically in Fig. la, isformed by drilling in the bodies |83, |92 and |69 interconnectedpassages as indicated at 5|a, 5|b, 5|c, 5|d, and 5|e, from the releaseport 50 of the chamber 46 to the port 52 of the pilot Valve 53. Thepressure release passage 56 is formed from the pressure release port 55of the upper chamber 41a to the port 51 of the valve 53, Fig. a, byinterconnected drilled passages, 56a, 56h and 56o in the body |69, asshown in Fig. 11. As shown in Figs. l1 and 12, the pressure releasevalve closures 62 and 63 are formed on stems |81 having spheroidal innerends |88 seated in openings |89 in the ends of the valve piston 21,thereby supporting the closures 62 and 63 so that they are self-aligningwith respect to the ports 50 and 55.

As shown in Figs. 8, 8b, 9, and 9a, the pumping chambers 3| and 32,schematically shown in Fig. la, are formed in a tubular member |90 whichforms part of the pumping section |8 by a median partitioned wall |9|which extends substantially from end to end of the tubular member |90.As shown in Fig. 8b, the edges |92 of the partition wall |9| are flared,and these flared edges of the partition wall |9| are provided withcurved surfaces |93 which merge with the inner surface of the tubularmember |90, cooperating therewith to form chambers 3| and 32 ofapproximately semi-circular cross section with rounded edges, followingthe curved surfaces |93. The upper end of the tubular member is brazedin a sleeve coupling |94 which has a bushing |95 threaded into its upperend for connection by screws |96 to the lower end of the head |84 whichcloses the lower end of the outer shell As shown in Fig. 9, the lowerend of the tubular member |90 is brazed'in a sleeve connector |91 havinga transverse Wall |98 and an internally threaded lower extension' |99 toreceive an oil inlet tube 200. Referring to Fig. 8, the upper end 9|' ofthe partition wall |9| and an internal iiange 20| inthe coupling |94,form a shoulder around the upper ends of the pumping chambers 3| and 32.Upper connectors 202 for the expansile-contractile members 33 and 34 aredisposed at the' upper ends of the chambers 3| and 32, each of thesemembers being of the form shown in Figs'. 8c and 8e. They are each ofcuplike form and have a top plate 203 and a downwardly extending sidewall 204 externally shaped so as to correspond to the cross sectionalshape of the chambers 3| and 32 and being externally of such size as toslip down into the upper end of a chamber 3| or 32. Each top wall 203 ofthe connectors 202 is of larger area than the side wall cross section soas to provide a flange 205 projecting from the upper edge of the sidewall 204 for overlying the shoulder 20| formed by the upper end |9| ofthe wall |9| and the internal iiange 20| of the connector |94. The sidewall 204 of each connector 202 is internally tapered so as to provide acavity 206 which gradually decreases in area upwardly. As shown in Fig.8e, a clamping plug 201 is provided for each cavity 206. Also, side wall204 has around its upper edge adjacent the ange 205 a channel 208 toform a passage for the flow of gas or liquid to the inlet 209 oi. a gasbleed valve 2|0 for the upper end of the pumping chamber 3| or 32associated therewith. As shown in Figs. 8c and 8e, the anges 205 havetherein cooperating notches or recesses 209 dening an opening 2| alignedwith the upper end of an oil discharge passage 2|2 formed along therightward side of the partition wall |9|, and forming a connectingaperture between the passage 2|2 and the oil discharge passage 2|3through the bodies |85 and |84, the upper end of this passage 2| 3communicating with the annular discharge space or passage |1 within theouter shell As shown in Figs. 8c and 8d, the gas escape valves 2|0 areformed by drilling openings 2|4 horizontally into the top walls 203 ofthe connectors 202, from the notches 209', and slidably disposing inthese openings 2|4 are longitudinally channeled closures 2|5 adapted toengage seats 2| 6 at the inner ends of the openings 2|4, and therebyprevent reverse flow of iluid through the valve inlet passages 209. Asshown in Fig. 8c, a bow spring 2|1 is disposed in the opening 2|| formedby the notches 209 in such position that its ends will engage the rearends of the closures 2 5 and yieldably force them outwardly into closingrelation to the seats 2|6. y

As shown in Figs. 9 and 9b, the transverse wall |98 has therein inletand discharge ports 2|8 and 2|9 communicating with the lower end of thepumping chamber 3|, inlet and discharge ports 220 and 22| communicatingwith the lower end of the pumping chamber 32. A valve body 222, which isclamped against the lower face of the wall |98 by the upper end of theoil inlet tube 200, has therein two oil inlet passages 223.communicating respectively with the ports 218 and 220 and each havingtherein an inlet check valve 35. The body 222 also has therein a pair ofdischarge valve passages 225 for connecting the ports 2I9 and 22| withan opening 226 in the transverse wall |98, which opening 226communicates with the lower end of the pumped oil discharge passage 2|2.In each of the discharge passages 225 there is a discharge check valve36. As shown in Figs. 9 and 9c, a plate 228 is secured to the lower faceof the body 222 for supporting an inlet screen 220 which projectsdownwardly within the oil inlet tube 200. Diagonal openings 230, in theplate 228, connect the lower end of the inlet passages 223 of the body222 with the upper ends of oil inlet tubes 23| which project downwardlyfrom the head 228 within the screen 229. When the expansile-contractilemembers 33 and 34 are alternately collapsed and expanded in the chambers3| and 32, oil will be drawn in through the passages 223, into thechambers 3| and 32, and will be discharged therefrom through thedischarge passages 225.

Each of the expansile-contractile members 3| and 32 consists of apreformed tube 232, Fig. 13, of flexible material, such as a syntheticrubbei1 compound of oil-resisting qualities either reenforced ornon-reenforced as may be desired. This tube 232 is molded to the shapeshown in Figs. 13, 1311.132), 13C, and 13d. At the plane indicated bythe line b-b of Fig. 13, the tube 232 has the cross-sectional form shownin Fig. 13b. Its external form and size at this plane b b are the sameas the interior of the pumping chambers 3| and 32 in which it is to beused. At this plane it has a convex wall portion 233 and a flat wallportion 234 connected to the curved wall portion 233 by the edge wallportions 235 of sharper curvature. Upwardly from the plane b-b the tube232 gradually changes from the approximately semi-circular form shown inFig. 13b to circular form as shown in Fig. 13a. However, the change ofthe tube from flattened form, as shown in Fig. 13b, to circular form, asshown in Fig. 13a, is accomplished without change in the circumferenceof the tube. Therefore, it is possible to deform the upper end of thetube 232 from the circular form in which it is shown in Fig. 13a to theform disclosed in Fig. 13b, in which form the upper end of the tube 232will fit into the pumping chamber. However, there will be a constanttendency for the upper part of the tube 232 to resume circular form andtherefore the upper portion of the tube 232 will press tightly againstthe flat surface of the adjacent partition wall ISI when the tube is ina pumping chamber 3| or 32.

Downwardly from the plane b-b, Fig. 13, the tube 232 gradually changestoward the form shown in Fig. 13e, and then to the form shown in Fig.13d. The inner or flat wall 234 of Fig. 13b is bent inwardly so thatregarded in cross section, it will have a reentrant curve 236. Thiscurving of the rubber wall 234 at 236 will result in the edge curves 235being drawn toward each other as indicated at 235 in Fig. 13o, and asthe reentrant curve of the wall is increased so that it substantiallytouches the wall 233 as shown in Fig. 13d, the edge curves 235 of thetube 232 will be further drawn toward each other as indicated at 235D.AIt will be understood that the change in the form of the tube wall fromthe plane b--b to the plane d-d will be accomplished without substantialchange in thecircumference of the tube; therefore, it is possible toinflate the device, as shown in Figs. 13, 13o and 13d, intoengagementwith the adjacent walls of the pumping chamber in which it isemployed without stretching the tube wall. Below the plane df-d the tube232 relatively rapidly changes from the form shown in Fig. 13d to theform shown in Fig. 13o so that its lower end -231 will fit into a lowerconnector or closure 238, as shown in Figs. 9, 9a, and 9d. As shown inFig. 9e, the closure 238 comprises a cup having a side wall 239 ofexternal form and size corresponding to the cross sectional size andshape of a pumping chamber 3| or 32, so that the member 232 will t intothe lower end of a pumping chamber as shown in the preceding iigures. Onthe inner face of the flat portion 240 of the wall 239 there is anarcuate wall 24| dening a vertical oil passage 242. The arcuate wall 24|cooperates with the wall 239 to form an upwardly faced cavity 243 havingthe same outline as the lower end 231 of the tube 232, so that the lowerend 231 of the tube 232 may be received within the cavity 243 andtherein clamped by a tapered clamping plug 244. The inner surface 245 ofthe walls 239 and 24| dening'the cavity 243 are tapered downwardly tocorrespond to the external taper of the clamping plug 244. As shown inFig. 9d, the clamping plug 244 is placed in the lower end 231 of thetube 232 and the lower end of the tube and the plug are inserted in thecavity 243. Screws 246 are then employed to pull the plug 244 down intothe tapered cavity 243, thereby clamping the lower end 231 of the tube232 in the recess 243.

At the upper end of the oil passage 242 a rounded cover or closure 241is supported by means of a hairpin spring 248 having outwardly bentportions 249 which enter laterally directed openings 25|) in the concavesurface of the cover 241. The lower portion ci the spring 248 is clampedagainst the ilat wall portion 240 of the lower tube closure 238 by achanneled nut 25| held by a screw 252. This spring 248 is of such formthat it tends to hold the cover 241 in the open position in which it isshown in Figs. 9d and 9e, in which position the cover 241 permits a freeflow of oil through the passage 242. When the tube 232 is expanded orinflated from the shape thereof shown in full lines in Fig. 9d, so thatthe reentrant wall portion 236 of the tube will be moved into theposition shown by dotted lines 236', the cover 241 will be swung intoits dotted line position 241 to close the upper end of the passage 242and prevent fluid pressure acting within the tube 232 from forcing aportion of the wall of the tube down into the upper end of the opening242. The connector or closure 238, as shown in Fig. 9d, is held downagainst thel upper face of the transverse wall |98V by means of a screw253, which passes upwardly through the Wall |98 and threads into thelower end wall 254 of the member 238. The lower end of the passage 242is expanded so that it will communicate with one inlet and one outletport in the transverse wall |98. For example, the expanded lower end ofthe passage 242 is shown in connection with the inlet and outlet ports 2|8 and 2|9 of the transverse wall |98. The upper end of each tube 232 isinserted in the cavity 206 of an upper connector 202 and is clampedtherein by a clamping body 201, the body 201 being drawn tightly up intothe cavity 206 by screws 255, as shown in Fig. 8. Each top plate 203 ofa connector 202 has an opening 256 therein, Fig. 8c, `and each clampingbody 201 has an opening 2 51 extended vertically therethrough,connecting

